Brewster



Jan. 24, 1956 A. BREWSTER PULVERIZING MACHINE Filed March 23, 1953 2 Sheets-Sheet l my hm f m. m. mm om m @vll i www iin E/ mv ilu 2 ov U.. mw t i t im S l mv mm M v n l www. 2r, l. J l wv om E 2 To v l n. om om NN N N 'ITV n` N .0 M

wm mm O- INVEN-ron ALBERT BREWSTER ATTORNEY Jan. 24, 1956 A. BREWSTER 2,732,136

PULVERIZING MACHINE Filed Maron 23. 195s 2 sheets-sheet 2 SZM H \m 1 VIICIIIIIIIIIIL. Y llllll-lll INVEN-ron ALBE RT BREWSTER ATTORNEY United States Patent() PULVERIZING MACHINE Albert Brewster, Auburndale, Fla., assigner of thirty per cent to Earl J. Hensel, Jr., Lakeland, Fla.

Application March 23, 1953, Serial No. 344,086

2 Claims. (Cl. 24154) This invention relates to material treatment and more particularly to the breaking up or reduction in size of the material. Specifically the invention relates to a machine for `the pnlverizing of non-metallic materials.

Machines employed for pulverizing have not been satisfactory for certain reasons including lack of durability due to the direct contact or impact of the material with the container during operation. For example in grinding the shock is transmitted throughout the length and breadth of the machine with consequent damaging effect.

It is an object of the `invention to provide a simple, inexpensive, durable and efficient pulverizing machine in which the housing is rotated and pulverizing mechanism within the housing is likewise rotated but in which instead of the customary hammering of the material against the anvil type of operation the material is subjected to the operation of the hammer. Also the inertia of the moving material is relied upon as a substitute for the anvil and the pulverizing is'facilitated by the impact of the material upon other material within the machine.

Another object of the invention is to provide a pulverizing machine which is continuously operated and from which the powder is removed from midair within the machine by an exhaust fan. Also the size of the particles removed through the discharge opening is determined by the suction of the fan.

Further objects and advantages of the invention will be apparent from the following specification taken in conjunction with the accompanying drawings, wherein:

Fig. l is a side elevation illustrating one application of the invention;

Fig. 2, a vertical section;

Fig. 3, a section on the line 3-3 of Fig. 2; and

Figures 4 and 5 are fragmentary longitudinal details.

Briey stated the invention comprises a rotary cylindrical casing mounted on an axial horizontally disposed shaft, said casing having an inlet at one end and an outlet at the other end. The cylinder has a pair of external supporting rings, one at each end, each of which rests upon a pair of spaced rollers adjacent the lower portion of the casing and being engaged from above by a corresponding roller. The casing has about the exterior of its cylindrical wall an annular rack driven by a pinion on a shaft powered from a motor or other source.

The shaft on which the casing is mounted is rotatable by a motor or other source of power such shaft having attached thereto within the casing a pulverizing mechanism in the form of a series of multiple hammers spaced around the shaft in four groups ninety degrees apart.

The interior of the casing is provided with internal ribs or projections of which, for purposes of illustration, there are twelve in number equally spaced around the interior of the casing. When the casing is rotated material introduced through the inlet opening will be disposed along the lower portion of the casing and then carried as the casing rotates by the projections until they fall 2,732,136 Patented Jan. 24, 1956 ICC by gravity and come in contact with the rapidly rotating hammers carried by the shaft. The falling material is disintegrated in midair, some of the particles being hurled into contact with other portions of the material, either being carried by the casing, or while falling or being projected through the air within the casing. The powder thus produced is withdrawn from midair through the discharge opening by a suction fan, the size of the particles being determined by the suction.

With continued reference to the drawings, on a foundation 10 are mounted a plurality of roller supporting brackets 11 anchored by bolts 12 to the foundation. Within the brackets 11 are mounted bearing rollers 13, two pairs of opposed rollers being mounted on the foundation 10 and on these rollers a cylindrical casing 14 is supported.

The casing 14 is provided with supporting rings 15 at each end to which are attached by bolts 16 end members or header plates 17 and 18. Above the cylinder 14 are mounted additional rollers 19 carried by brackets 26 attached by bolts 21 to a support 22, one roller 19 being located above the axis of the cylinder in contact with each of the rings 15. Each of the end members or header plates 17 and 18 is provided with an opening, the end plate 18 having an opening 23 in which is mounted the inlet 24 through which the material to be pulverized is introduced into the casing 14. The end plate 17 has an opening 25 in which is located the outlet 26 such outlet having an enlarged flared mouth 27 and a variable capacity exhaust fan 28 for withdrawing powder from the casing. y

The casing 14 is provided on its interior with a plurality of segmental plates 29 having central longitudinal ribs 30. 'These plates and ribs extending axially of the casing and form, within the casing, a lining against which the material to be pulverized engages instead of the inner wall of the casing. Thus when material is introduced through the inlet 24 it will be deposited in the lower portion of the casing and carried by the ribs 30 around the casing until it falls by gravity.

In order to produce rotation of the casing itis provided on its exterior with a ring 31 which is engaged and driven by a pinion 32 on a shaft 33 supported in brackets 35 and driven through gears 36 and 37 by a motor 40.

A shaft 41 is mounted by means of bearings 42 on supports 43 the relative position of the shaft being determined by lock collars 44 on opposite sides of the brackets 43. On the shaft 41 within the casing 14 is mounted pulverizing or disintegrating mechanism comprising a sleeve 45 fastened by a key 46 to the shaft 41 such sleeve having spaced radial plates 47 between the outer parallel portions of which are mounted a series of hammers 48 by means of a series of pins 49. There are four sets of hammers and pins located approximately ninety degrees apart and equally spaced from the shaft 41. In order to reinforce the disk plates 47 a ring 50 is secured around the margin of the outer surface of the outer plates 47 by welding or in any other desired manner and a flat ring 51 of a smaller diameter is secured to the plate 47 by means of bolts 52 engaging the plates 47. The shaft 41 is rotated by means of gears 53 and 54 from a motor 55 although if desired instead of two motors 40 and 55 a single motor may be used to power both shafts 33 and 41.

When the shaft 41 is rotated the hammers 48 will be substantially in the position shown in Figures 2, 3, and 5 by the action of centrifugal force and will come in contact with material introduced through the inlet 24 and carried by the ribs 30 upwardly until it drops by gravity where it will be engaged by the rapidly revolving hammers and broken by some of the material being directed 3 in Contact with the hammers and into contact with additional material within the casing. Thus pulverizing is accomplished in midair with minimum direction of the material against the wall of the casing and the powder thus produced is withdrawn by means 'of the exhaust fan 28.

The impact of the material upon the hammers is such as to drive it back against the bafe plates or when the inside sleeve 45 is driven in the opposite direction from the outside cylinder 14 then the material is driven against other material with force sufficient to pulverize the same and that when the material is pulverized to the desired tneness it is removed by an exhaust fan, the amount removed to be regulated by the amount of suction maintained in the discharge opening.

It will be obvious to those skilled in the art that various changes may be made in the invention without departing from the spirit and scope thereof and therefore this invention is not limited to that shown in the drawings nor to that described in the specification but only as indicated in the appended claims.

What is claimed is:

1. In a fluid swept pulverizer a cylindrical casing mounted for rotation on a horizontal axis, an inlet for supplying material to be pulverized centrally into said casing at one end thereof, a plurality of curved plates juxtaposed to form a complete lining for the cylindrical wall of the casing, each curved plate having a longitudinal integral rib of tapered form adapted to carry material in the casing upwardly to permit the same to fall by gravity, a rotor within the casing, a plurality of radially projecting hammers pivotally mounted on the rotor and having enlarged outer ends, independent motor means for driving said casing and rotor in opposite directions, said hammers when rotated extending outwardly toward the casing and their ends being spaced from the ribs a substantial distance, whereby the material to be pulverized falling by gravity from the upper part of the casing is struck by the hammers in mid air reducing the impact of the material upon the casing and the consequent damage thereto, and a centrally located outlet in the other end of said casing for withdrawing pulverized material from said casing.

2. A pulverizer as set forth in claim 1, wherein each hammer is substantially T-shaped with the pivot means located in the end of the leg thereof and said hammers being equally spaced around the rotor.

References Cited in the iile of this patent UNITED STATES PATENTS Re. 17,462 Waterman Oct. l5, 1929 104,910 Whelpley June 28, 1870 726,511 Curtis Apr. 28, 1903 864,357 Brown Aug. 27, 1907 1,358,782 Philippi Nov. 16, 1920 1,424,922 Knittel Aug. 8, 1922 1,458,387 Bourne June 12, 1923 1,536,990 Van Gelder May 5, 1925 1,647,555 Wells Nov. 1, 1927 1,744,028 Borton Jan. 21, 1930 2,108,793 Barton Feb. 22, 1938 2,109,856 Beaudry Mar. 1, 1938 2,456,266 Gates Dec. 14, 1948 2,542,482 Cully Feb. 20, 1951 FOREIGN PATENTS 4,692 Austria July 10, 1901 29,220 France Mar. 10, 1925 (1st addition to No. 576,368)

OTHER REFERENCES Types of Tube-Mill Liners, photostat in Div. 55. Mineral Industry, volume 47 (1938), page 682. 

